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    <title>Document</title>
    <style>
        .nav a{
            display: inline-block;
            width: 120px;
            height: 58px;
            text-align: center;
            line-height: 48px;
            color: pink;
            text-decoration: none;
        }
        .nav-bg1 {
            background: url(images/bg1.png) no-repeat;
        }
        .nav-bg1:hover{
            background-image: url(images/bg11.png);
        }
        .nav-bg2 {
            background: url(images/bg2.png) no-repeat;
        }
        .nav-bg2:hover{
            background-image: url(images/bg22.png);
        }
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    <div class="nav">
        <a href="#" class="nav-bg1">五彩导航</a>
        <a href="#" class="nav-bg2">五彩导航</a>
        <a href="#">五彩导航</a>
        <a href="#">五彩导航</a>
        <a href="#">五彩导航</a>
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